org.apache.tinkerpop.gremlin.process.traversal

## Interface Traversal.Admin<S,E>

- All Superinterfaces:
    AutoCloseable, Cloneable, Iterator<E>, Serializable, Traversal<S,E>
  All Known Subinterfaces:
    CredentialTraversalDsl<S,E>, GraphTraversal.Admin<S,E>, RemoteTraversal<S,E>
  All Known Implementing Classes:
    AbstractLambdaTraversal, AbstractRemoteTraversal, ColumnTraversal, ConstantTraversal, DefaultGraphTraversal, DefaultTraversal, DriverRemoteTraversal, EmbeddedRemoteTraversal, EmptyTraversal, HaltedTraversersCountTraversal, IdentityTraversal, LoopTraversal, PredicateTraversal, ScriptTraversal, TokenTraversal, TrueTraversal, ValueTraversal
  Enclosing interface:
    Traversal<S,E>

      public static interface Traversal.Admin<S,E>
      extends Traversal<S,E>

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from interface org.apache.tinkerpop.gremlin.process.traversal.Traversal

      `Traversal.Admin<S,E>, Traversal.Exceptions, Traversal.Symbols`

  - ### Method Summary

    All Methods Instance Methods Abstract Methods Default Methods
    Modifier and Type | Method and Description
    --- | ---
    `default void` | `addStart(Traverser.Admin<S> start)` Add a single `Traverser.Admin` object to the head of the traversal.
    `default void` | `addStarts(Iterator<Traverser.Admin<S>> starts)` Add an iterator of `Traverser.Admin` objects to the head/start of the traversal.
    `<S2,E2> Traversal.Admin<S2,E2>` | `addStep(int index, Step<?,?> step)` Add a `Step` to an arbitrary point in the traversal.
    `default <E2> Traversal.Admin<S,E2>` | `addStep(Step<?,E2> step)` Add a `Step` to the end of the traversal.
    `void` | `applyStrategies()` Apply the registered `TraversalStrategies` to the traversal.
    `Traversal.Admin<S,E>` | `clone()` Cloning is used to duplicate the traversal typically in OLAP environments.
    `default boolean` | `equals(Traversal.Admin<S,E> other)`
    `Bytecode` | `getBytecode()` Get the `Bytecode` associated with the construction of this traversal.
    `default Step<?,E>` | `getEndStep()` Get the end/tail of the traversal.
    `Optional<Graph>` | `getGraph()` Gets the `Graph` instance associated to this `Traversal`.
    `TraversalParent` | `getParent()` Get the `TraversalParent` `Step` that is the parent of this traversal.
    `TraversalSideEffects` | `getSideEffects()` Get the `TraversalSideEffects` associated with the traversal.
    `default Step<S,?>` | `getStartStep()` Get the start/head of the traversal.
    `List<Step>` | `getSteps()` Get the `Step` instances associated with this traversal.
    `TraversalStrategies` | `getStrategies()` Get the `TraversalStrategies` associated with this traversal.
    `default Optional<TraversalSource>` | `getTraversalSource()` Gets the `TraversalSource` that spawned the `Traversal` instance initially if present.
    `TraverserGenerator` | `getTraverserGenerator()` Get the `TraverserGenerator` associated with this traversal.
    `Set<TraverserRequirement>` | `getTraverserRequirements()` Get the set of all `TraverserRequirement`s for this traversal.
    `default Supplier<TraverserSet<S>>` | `getTraverserSetSupplier()` Gets a generator that creates new `TraverserSet` instances for steps in the traversal.
    `boolean` | `isLocked()` When the traversal has had its `TraversalStrategies` applied to it, it is locked.
    `default boolean` | `isRoot()` Determines if the traversal is at the root level.
    `default Traverser.Admin<E>` | `nextTraverser()`
    `<S2,E2> Traversal.Admin<S2,E2>` | `removeStep(int index)` Remove a `Step` from the traversal.
    `default <S2,E2> Traversal.Admin<S2,E2>` | `removeStep(Step<?,?> step)` Remove a `Step` from the traversal.
    `default void` | `reset()` Call the `Step.reset()` method on every step in the traversal.
    `void` | `setGraph(Graph graph)`
    `void` | `setParent(TraversalParent step)` Set the `TraversalParent` `Step` that is the parent of this traversal.
    `void` | `setSideEffects(TraversalSideEffects sideEffects)` Set the `TraversalSideEffects` of this traversal.
    `void` | `setStrategies(TraversalStrategies strategies)` Set the `TraversalStrategies` to be used by this traversal at evaluation time.

    - ### Methods inherited from interface org.apache.tinkerpop.gremlin.process.traversal.Traversal

      `asAdmin, close, explain, fill, forEachRemaining, forEachRemaining, iterate, next, none, profile, promise, toBulkSet, toList, toSet, toStream, tryNext`

    - ### Methods inherited from interface java.util.Iterator

      `hasNext, next, remove`

- - ### Method Detail

    - #### getBytecode

          Bytecode getBytecode()

      Get the `Bytecode` associated with the construction of this traversal.
      Returns:
        the byte code representation of the traversal

    - #### addStarts

          default void addStarts(Iterator<Traverser.Admin<S>> starts)

      Add an iterator of `Traverser.Admin` objects to the head/start of the traversal. Users should typically not need to call this method. For dynamic inject of data, they should use `InjectStep`.
      Parameters:
        `starts` - an iterators of traversers

    - #### addStart

          default void addStart(Traverser.Admin<S> start)

      Add a single `Traverser.Admin` object to the head of the traversal. Users should typically not need to call this method. For dynamic inject of data, they should use `InjectStep`.
      Parameters:
        `start` - a traverser to add to the traversal

    - #### getSteps

          List<Step> getSteps()

      Get the `Step` instances associated with this traversal. The steps are ordered according to their linked list structure as defined by `Step.getPreviousStep()` and `Step.getNextStep()`.
      Returns:
        the ordered steps of the traversal

    - #### addStep

          default <E2> Traversal.Admin<S,E2> addStep(Step<?,E2> step)
                                              throws IllegalStateException

      Add a `Step` to the end of the traversal. This method should link the step to its next and previous step accordingly.
      Type Parameters:
        `E2` - the output of the step
      Parameters:
        `step` - the step to add
      Returns:
        the updated traversal
      Throws:
        `IllegalStateException` - if the `TraversalStrategies` have already been applied

    - #### addStep

          <S2,E2> Traversal.Admin<S2,E2> addStep(int index,
                                                 Step<?,?> step)
                                          throws IllegalStateException

      Add a `Step` to an arbitrary point in the traversal.
      Type Parameters:
        `S2` - the new start type of the traversal (if the added step was a start step)
        `E2` - the new end type of the traversal (if the added step was an end step)
      Parameters:
        `index` - the location in the traversal to insert the step
        `step` - the step to add
      Returns:
        the newly modulated traversal
      Throws:
        `IllegalStateException` - if the `TraversalStrategies` have already been applied

    - #### removeStep

          default <S2,E2> Traversal.Admin<S2,E2> removeStep(Step<?,?> step)
                                                     throws IllegalStateException

      Remove a `Step` from the traversal.
      Type Parameters:
        `S2` - the new start type of the traversal (if the removed step was a start step)
        `E2` - the new end type of the traversal (if the removed step was an end step)
      Parameters:
        `step` - the step to remove
      Returns:
        the newly modulated traversal
      Throws:
        `IllegalStateException` - if the `TraversalStrategies` have already been applied

    - #### removeStep

          <S2,E2> Traversal.Admin<S2,E2> removeStep(int index)
                                             throws IllegalStateException

      Remove a `Step` from the traversal.
      Type Parameters:
        `S2` - the new start type of the traversal (if the removed step was a start step)
        `E2` - the new end type of the traversal (if the removed step was an end step)
      Parameters:
        `index` - the location in the traversal of the step to be evicted
      Returns:
        the newly modulated traversal
      Throws:
        `IllegalStateException` - if the `TraversalStrategies` have already been applied

    - #### getStartStep

          default Step<S,?> getStartStep()

      Get the start/head of the traversal. If the traversal is empty, then an `EmptyStep` instance is returned.
      Returns:
        the start step of the traversal

    - #### getEndStep

          default Step<?,E> getEndStep()

      Get the end/tail of the traversal. If the traversal is empty, then an `EmptyStep` instance is returned.
      Returns:
        the end step of the traversal

    - #### applyStrategies

          void applyStrategies()
                        throws IllegalStateException

      Apply the registered `TraversalStrategies` to the traversal. Once the strategies are applied, the traversal is "locked" and can no longer have steps added to it. The order of operations for strategy applications should be: globally id steps, apply each strategy in turn to root traversal, then recursively to nested traversals.
      Throws:
        `IllegalStateException` - if the `TraversalStrategies` have already been applied

    - #### getTraverserGenerator

          TraverserGenerator getTraverserGenerator()

      Get the `TraverserGenerator` associated with this traversal. The traversal generator creates `Traverser` instances that are respective of the traversal's `TraverserRequirement`.
      Returns:
        the generator of traversers

    - #### getTraverserSetSupplier

          default Supplier<TraverserSet<S>> getTraverserSetSupplier()

      Gets a generator that creates new `TraverserSet` instances for steps in the traversal. Providers may override this default implementation to provider their own `TraverserSet`.

    - #### getTraverserRequirements

          Set<TraverserRequirement> getTraverserRequirements()

      Get the set of all `TraverserRequirement`s for this traversal.
      Returns:
        the features of a traverser that are required to execute properly in this traversal

    - #### reset

          default void reset()

      Call the `Step.reset()` method on every step in the traversal.

    - #### setSideEffects

          void setSideEffects(TraversalSideEffects sideEffects)

      Set the `TraversalSideEffects` of this traversal.
      Parameters:
        `sideEffects` - the sideEffects to set for this traversal.

    - #### getSideEffects

          TraversalSideEffects getSideEffects()

      Get the `TraversalSideEffects` associated with the traversal. This method should not be called externally for purposes of retrieving side-effects as traversal results. Traversal results should only be returned by way of the execution of the traversal itself. Should a side-effect of a traversal be needed it should only be obtained by using `GraphTraversal.cap(String, String...)` so that the side-effect can be included as part of the traversal iteration. Relying on this method to get side-effects in these situations may not result in consistent behavior across all types of executions and environments (e.g. remoting).
      Returns:
        The traversal sideEffects

    - #### setStrategies

          void setStrategies(TraversalStrategies strategies)

      Set the `TraversalStrategies` to be used by this traversal at evaluation time.
      Parameters:
        `strategies` - the strategies to use on this traversal

    - #### getStrategies

          TraversalStrategies getStrategies()

      Get the `TraversalStrategies` associated with this traversal.
      Returns:
        the strategies associated with this traversal

    - #### setParent

          void setParent(TraversalParent step)

      Set the `TraversalParent` `Step` that is the parent of this traversal. Traversals can be nested and this is the means by which the traversal tree is connected. If there is no parent, then it should be a `EmptyStep`.
      Parameters:
        `step` - the traversal holder parent step or `EmptyStep` if it has no parent

    - #### getParent

          TraversalParent getParent()

      Get the `TraversalParent` `Step` that is the parent of this traversal. Traversals can be nested and this is the means by which the traversal tree is walked.
      Returns:
        the traversal holder parent step or `EmptyStep` if it has no parent.

    - #### isRoot

          default boolean isRoot()

      Determines if the traversal is at the root level.

    - #### clone

          Traversal.Admin<S,E> clone()

      Cloning is used to duplicate the traversal typically in OLAP environments.
      Returns:
        The cloned traversal

    - #### isLocked

          boolean isLocked()

      When the traversal has had its `TraversalStrategies` applied to it, it is locked.
      Returns:
        whether the traversal is locked

    - #### getGraph

          Optional<Graph> getGraph()

      Gets the `Graph` instance associated to this `Traversal`.

    - #### getTraversalSource

          default Optional<TraversalSource> getTraversalSource()

      Gets the `TraversalSource` that spawned the `Traversal` instance initially if present. This `TraversalSource` should have spawned from the associated `Graph` returned from `getGraph()`.

    - #### setGraph

          void setGraph(Graph graph)

    - #### equals

          default boolean equals(Traversal.Admin<S,E> other)

    - #### nextTraverser

          default Traverser.Admin<E> nextTraverser()

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